读“南水北调西线工程路线示意图”，完成问题。 小题1:西线工程建设的最大困难是

An earthquake happens when two plates rub (碰撞) together. The earth plates travel in different directions and at different speeds. If one plate is slowly forced underneath the other,  pressure builds up until the plates break apart. This process causes the ground to move. It is an earthquake. In other words, earth-quakes are the shaking of the earth’s surface caused by the earth’s rocky outer layer as a result of the energy stored within the earth. The strain within the rocks is suddenly released (释放).

The damage an earthquake causes depends on where it is and the time it is happening. If an unpopulated region is struck, there will be low loss of life or property. If it hits a large city, there may be many in-juries and much destruction. Many of the areas at risk are largely populated now. Major earthquakes hitting those areas today could produce terrible damage.

Actually, there are several million small earth-quakes every year.  Large earthquakes such as the 1964 Alaskan quake that measured 9.2 on the Richter scale, cause millions of dollars in damage. In the last 500 years, millions of people have been killed by earth-quakes around the world — including 240,000 in the 1976 Tangshan earthquake in China.

A 60-second or less earthquake can cause devastation that continues for years after the first tremor (小震). In 1972, a series of severe earthquakes struck Managua, Nicaragua. Fifteen years later, the city still looked the way it had a week after the earthquake hit, because the country did not have the necessary money to rebuild it.

The shaking of the earth is sometimes not the greatest disaster. It is in the ensuing fires and floods that often the greatest damage occurs. In the 1906 earthquake, it was the fires caused after it that did the majority of the damage. An earthquake can also destroy dams high above a city or valleys, causing floods to sweep down and sweep away everything in their path.

小题1:Which of the following is the main idea of the first paragraph?

A．An earthquake comes from inside the earth.

B．The earth has great energy in storage.

C．How the earth plates move.

D．How an earthquake happens.小题2:How many examples are used in the passage to show the damage and destruction earthquakes cause?

A．Three.

B．Four.

C．Five.

D．Six.小题3:Which of the following is mentioned to show that an earthquake can kill too many people?

A．The 1964 Alaskan quake.

B．The 1976 Tangshan earthquake.

C．The 1972 Managua earthquake.

D．The 1906 earthquake.小题4:The underlined word “ensuing” in the last paragraph probably means ______.

A．causing too much heat and great damage

B．causing many injuries and much destruction

C．happening as a result of another event

D．happening suddenly and unexpectedly小题5:By giving the example in Paragraph 4, the author wants to show that ______.

A．an earthquake doesn’t last long

B．the damage can last long

C．people in Managua suffered too much

D．Nicaragua is still a poor country

半径为60m和40m的两条圆形轨道在A点处相切，两人从A点出发，以相同速度分别沿两条轨道行走，当他们第一次相遇时，沿小圆轨道行走的人共走了( )圈

A．2

B．3

C．4

D．5

E．(E) 6

生活中在电视遥控器中使用的柱形干电池的电压是多少伏？

旋翼轴套随安装在心轴上的（）个轴承自由转动，轴承的安装必须正确。

A、5

B、6

C、7

D、8

下列关于事务处理的叙述中，哪一条是不正确的______。

A．事务的ACID特性指的是原子性、一致性、唯一性和持久性
B．成功完成执行的事务称为已提交事务
C．已提交事务使数据库进入一个新的一致状态
D．已中止事务对数据库所做的任何改变必须撤销